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I had some trouble downloading a particular web site and I fiddled with my browser settings, now it's worse! How can I restore the original settings?

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In an effort to solve the problem below, I fiddled with a lot of settings. How can I revert to the settings as they originally featured ? (the default settings)

In an effort to solve the problem below, I fiddled with a lot of settings. How can I revert to the settings as they originally featured ? (the default settings)

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You can use "Reset all user preferences to Firefox defaults" on the Safe mode start window.